[PATCH] D18427: CodeGen: Add DetectDeadLanes pass.

[Quentin Colombet via llvm-commits]

qcolombet accepted this revision.
qcolombet added a comment.
This revision is now accepted and ready to land.

LGTM.


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Comment at: lib/CodeGen/DetectDeadLanes.cpp:254
@@ +253,3 @@
+    unsigned SubIdx = MI.getOperand(2).getImm();
+    assert(OpNum == 1 && "EXTRACT_SUBREG must have one register operand only");
+    DefinedLanes = TRI->reverseComposeSubRegIndexLaneMask(SubIdx, DefinedLanes);
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Great, that is the information I was looking for :).

Add a comment in runOnMachineFunction when we skip the pass to know why it is not run.


Repository:
  rL LLVM

http://reviews.llvm.org/D18427